Vintage Arthur Jay Plaid Two Piece Skirt Set

In good vintage condition. There's a stain on the inside shoulder lining (untreated) see photos showing two angles of the one stain. Athur Jay two piece skirt set. Jacket has 3/4 length sleeves, two front buttons, is lined, and has 4 faux pockets. The midi pleated skirt is not lined and has a zipper and button closure on the side. No size or care tag; brand tag only. Probably would best fit a size small, but please go by measurements. Measurements (laying flat, nothing doubled) Jacket pit to pit: 18" Sleeve length: 16" Length: 16" Skirt waist 12" Length: 25.5"